Aqueous Long-Term Solubility of Titania Nanoparticles and Titanium(IV) Hydrolysis in a Sodium Chloride System Studied by Adsorptive Stripping Voltammetry

被引：120

作者：

Schmidt, Jochen ^{[1
,2
]}

Vogelsberger, Wolfram ^{[1
]}

机构：

[1] Univ Jena, Inst Phys Chem, Chem & Earth Sci Fac, D-07743 Jena, Germany

[2] Univ Erlangen Nurnberg, Inst Particle Technol, D-91058 Erlangen, Germany

来源：

JOURNAL OF SOLUTION CHEMISTRY | 2009年 / 38卷 / 10期

关键词：

Titania; Nanoparticles; Dissolution; Titanium(IV) hydrolysis; Adsorptive stripping voltammetry of Ti(IV); DISSOLUTION KINETICS; RUTILE SOLUBILITY; ANATASE; TIO2; SIZE; PARTICLES; CHEMISTRY; BEHAVIOR; POWDERS; FLUIDS;

D O I：

10.1007/s10953-009-9445-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The solubility of industrially produced titanium dioxide nanoparticles has been studied in aqueous sodium chloride media in the pH range 1 to 13 at 25 degrees C by using adsorptive stripping voltammetry (AdSV). Kinetic dissolution curves have been obtained as well as long-term solubilities that provide an approximation of the equilibrium solubilities. The titania nanoparticles used in the dissolution experiments have been characterized by nitrogen sorption measurements, XRD and colloid titration. The equilibrium solubilities and titanium(IV) speciation and their dependences on pH have been modelled by assuming the formation of the mononuclear titanium hydroxo complexes [Ti(OH)(n)]((4-n)+) (n = 2 to 5) to be the only titanium species present. The solubility product of titanium dioxide and equilibrium constants for titanium(IV) hydrolysis, calculated from the AdSV solubility data, are presented.

引用

页码：1267 / 1282

页数：16

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